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The influence of social network structure on adolescents’ level of physical activity

Barnett, Tracie A et Henderson, Melanie . The influence of social network structure on adolescents’ level of physical activity In: 7th International Society for Physical Activity and Health Congress, 15-17 October 2018, London, England.

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We examined the relationship between the structure and composition ofadolescents’person social networks, and their levels of physical activity,using pilot data collected in the QUALITY study, an ongoing investigation onthe natural history of obesity. Participating adolescents (egos) nominated up to10 significant others (alters). Egos reported alter behaviours (e.g. frequency ofbeing physical active: never to very often) and characteristics (e.g. frequencyof interactions; proximity of residence) as well as ties between alters (whetheror not friends knew each other and how well). Sedentary time was measuredwith accelerometers worn for 7 days(minimum 4 days, 10 hours per day).Relationships were examined with Spearman rank correlations.

Social network analysis was performed in 46 adolescents (mean age16.3 yrs). On average each ego nominated 6.6 alters, and 51% livedoutside ego’s neighbourhood. Across networks, the average proportion offrequently physically active alters was 30%. Average degree centrality (anindicator of greater ties between alters) was 0.46, i.e. on average each alterwas connected to 46% network members.

Overall, sedentary time was positively correlated with network size (r=0.3) and with the proportion of friends living outside the neighbourhood (r=0.4); it was negatively correlated with normalized average degreecentrality (r=−.3) (i.e. the most sedentary adolescents had fewer friendswho knew each other).

Findings suggest that fewer opportunities for face to face interactionsmay be contributing to increased sedentary time. Thefindings help identifykey social and environmental targets to enhance interventions to reducesedentary behaviour.

Type de document: Document issu d'une conférence ou d'un atelier
Informations complémentaires: Journal of Physical Activity and Health (2018), 15 (suppl. 1), S26-S27
Mots-clés libres: -
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 06 août 2019 14:50
Dernière modification: 06 août 2019 14:50
URI: https://espace.inrs.ca/id/eprint/8083

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